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Class: IRB::Frame

Relationships & Source Files
Namespace Children
Exceptions:
FrameOverflow, FrameUnderflow
Inherits: Object
Defined in: lib/irb/frame.rb

Constant Summary

Class Method Summary

Instance Method Summary

Constructor Details

.new ⇒ Frame

Creates a new stack frame

[ GitHub ] 

  


# File 'lib/irb/frame.rb', line 32



def initialize
  @frames = [TOPLEVEL_BINDING] * INIT_STACK_TIMES
end


  







Class Method Details



  

    .bottom(n = 0)  
  



  

    

Convenience method for #bottom


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 67



def Frame.bottom(n = 0)
  @backtrace.bottom(n)
end


  








  

    .sender  
  



  

    

Returns the binding context of the caller from the last frame initialized


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 77



def Frame.sender
  eval "self", @backtrace.top
end


  








  

    .top(n = 0)  
  



  

    

Convenience method for #top


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 72



def Frame.top(n = 0)
  @backtrace.top(n)
end


  







Instance Method Details



  

    #bottom(n = 0)  
  



  

    

Returns the n number of frames on the call stack from the first frame initialized.



Raises FrameOverflow if there are no frames in the given stack range.


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 60



def bottom(n = 0)
  bind = @frames[n]
  fail FrameOverflow unless bind
  bind
end


  








  

    #top(n = 0)  
  



  

    

Returns the n number of frames on the call stack from the last frame initialized.



Raises FrameUnderflow if there are no frames in the given stack range.


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 50



def top(n = 0)
  bind = @frames[-(n + CALL_STACK_OFFSET)]
  fail FrameUnderflow unless bind
  bind
end


  








  

    #trace_func(event, file, line, id, binding)  
  



  

    

Used by Kernel.set_trace_func to register each event in the call stack


  



  [ GitHub ]


  

  


# File 'lib/irb/frame.rb', line 37



def trace_func(event, file, line, id, binding)
  case event
  when 'call', 'class'
    @frames.push binding
  when 'return', 'end'
    @frames.pop
  end
end